Correlations of acidity-basicity of solvent treated layered double hydroxides/oxides and their CO2 capture performance

The basicity and acidity of solvent-treated layered double hydroxide (ST-LDHs) and their layered double oxides (ST-LDOs) have been fully studied using Hammett titration, in situ FTIR, CO2-TPD and NH3-TPD. Five solvents (ethanol, acetone, isopropanol, ethyl acetate and 1-hexanol) were selected to tre...

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Κύριοι συγγραφείς: Leung, DWJ, Chen, C, Buffet, J-C, O'Hare, D
Μορφή: Journal article
Γλώσσα:English
Έκδοση: Royal Society of Chemistry 2020
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author Leung, DWJ
Chen, C
Buffet, J-C
O'Hare, D
author_facet Leung, DWJ
Chen, C
Buffet, J-C
O'Hare, D
author_sort Leung, DWJ
collection OXFORD
description The basicity and acidity of solvent-treated layered double hydroxide (ST-LDHs) and their layered double oxides (ST-LDOs) have been fully studied using Hammett titration, in situ FTIR, CO2-TPD and NH3-TPD. Five solvents (ethanol, acetone, isopropanol, ethyl acetate and 1-hexanol) were selected to treat [Mg0.72Al0.28(OH)2](CO3)0.14 (Mg2.5Al-CO3 LDH) and compared with traditional LDH co-precipitated from water. The Brønsted basicity strength of the ST-LDHs and ST-LDOs increased but was accompanied by a decrease in basic site density. In addition, the Lewis acidity of ST-LDOs also changes significantly, with medium strength Lewis acid sites dissapearing after solvent treatment. We found that the CO2 capture capacity of solvent treated LDOs is 50% higher than that of traditional co-precipitated LDO sample. The ethanol treated LDO exhibited the highest CO2 uptake of 1.01 mmol g−1. The observed CO2 capture performance of the ST-LDOs correlates linearly with the ratio of total acid sites to total basic sites.
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spelling oxford-uuid:92a885f2-b426-41d2-89df-c8a90c34ec4b2022-03-26T23:27:05ZCorrelations of acidity-basicity of solvent treated layered double hydroxides/oxides and their CO2 capture performanceJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:92a885f2-b426-41d2-89df-c8a90c34ec4bEnglishSymplectic ElementsRoyal Society of Chemistry2020Leung, DWJChen, CBuffet, J-CO'Hare, DThe basicity and acidity of solvent-treated layered double hydroxide (ST-LDHs) and their layered double oxides (ST-LDOs) have been fully studied using Hammett titration, in situ FTIR, CO2-TPD and NH3-TPD. Five solvents (ethanol, acetone, isopropanol, ethyl acetate and 1-hexanol) were selected to treat [Mg0.72Al0.28(OH)2](CO3)0.14 (Mg2.5Al-CO3 LDH) and compared with traditional LDH co-precipitated from water. The Brønsted basicity strength of the ST-LDHs and ST-LDOs increased but was accompanied by a decrease in basic site density. In addition, the Lewis acidity of ST-LDOs also changes significantly, with medium strength Lewis acid sites dissapearing after solvent treatment. We found that the CO2 capture capacity of solvent treated LDOs is 50% higher than that of traditional co-precipitated LDO sample. The ethanol treated LDO exhibited the highest CO2 uptake of 1.01 mmol g−1. The observed CO2 capture performance of the ST-LDOs correlates linearly with the ratio of total acid sites to total basic sites.
spellingShingle Leung, DWJ
Chen, C
Buffet, J-C
O'Hare, D
Correlations of acidity-basicity of solvent treated layered double hydroxides/oxides and their CO2 capture performance
title Correlations of acidity-basicity of solvent treated layered double hydroxides/oxides and their CO2 capture performance
title_full Correlations of acidity-basicity of solvent treated layered double hydroxides/oxides and their CO2 capture performance
title_fullStr Correlations of acidity-basicity of solvent treated layered double hydroxides/oxides and their CO2 capture performance
title_full_unstemmed Correlations of acidity-basicity of solvent treated layered double hydroxides/oxides and their CO2 capture performance
title_short Correlations of acidity-basicity of solvent treated layered double hydroxides/oxides and their CO2 capture performance
title_sort correlations of acidity basicity of solvent treated layered double hydroxides oxides and their co2 capture performance
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AT chenc correlationsofaciditybasicityofsolventtreatedlayereddoublehydroxidesoxidesandtheirco2captureperformance
AT buffetjc correlationsofaciditybasicityofsolventtreatedlayereddoublehydroxidesoxidesandtheirco2captureperformance
AT ohared correlationsofaciditybasicityofsolventtreatedlayereddoublehydroxidesoxidesandtheirco2captureperformance